Earth Systems and Atmosphere
1. Inform students they will learn about Earth's four main spheres, and the structure and composition of the atmosphere.
2. Distribute the Earth Systems and Atmosphere Exploration Sheet to each of the students.
3. Ask students to go to the Student Resources Web page and click the Earth Systems and Atmosphere link.
4. Instruct students to read the content pages about the Earth systems and atmosphere and answer the questions on their exploration sheets. Explain and clarify terminology and concepts as needed,
Many students often confuse the role of ozone in the stratosphere and ozone in the troposphere. Display the Atmospheric Ozone image from the students' Web page to the front of the class. Emphasize to students that in the troposphere the ozone is considered "bad ozone" since it is a pollutant near ground levels and has harmful effects to plants and animals. Ozone in the stratosphere is beneficial. It blocks harmful ultraviolet rays from the sun, protecting life on Earth. Without the ozone layer in the stratosphere, more of the Sun's UV light would penetrate the atmosphere and would reach the Earth's surface.
5. Review content and discuss aloud student responses to key questions on their exploration sheets. Ask students if they have any questions about concepts covered in the lesson and respond to their questions. Have students close their Web browser when they finish.
Teacher Resources/Content Support
Earth System - Print Version (PDF)